Carl wolf



(No Model.)

o. WOLF. MINERS SAFETY LAMB.

No. 530,217, Patented Dec. 4, 1894 UNITE STATES PATENT tries.

CARL WOLF, OF ZWICKAU, GERMANY.

MINERS SAFETY-LAM P.

SPECIFICATION forming part of Letters Patent No. 530,217, dated December4, 1894.

Application filed June 9, 1894- Serial No. 514,036- (No model.)

To all whom it m any concern.-

Be it known that I, CARL WOLF, a subject of the Emperorof Germany,residing at Zwickau, in the Empire of Germany, have invented certain newand useful Improvements in Miners Safety-Lamps, of which the followingis a specification.

In the magnetic locking devices for miners lamps as hitherto employed,the latches or catches for sealing the same were released by magneticattraction and were also provided with protecting plates of brass,German silver or other metal unaffected, or at least very slightlymagnetized. Such devices have in practice been found to be defective inthat the protecting plates or shields were readily pierced or boredthrough and thus access to the catches was obtained.

The principal object of my present invention is to construct a lamp insuch manner as that the locking device or catch of the lamp cannot bereleased by unauthorized persons, whereby the danger of mining disastersby explosions which occur with the hitherto con structed lamps, isovercome; and to which end my invention consists in providing a safetylamp with'a protecting plate of tempered steel, in place of the usualunmagnetizable soft metal plates,.and providing the same with aninsulating plate so that a magnet can act on the catch to release thesame.

The nature and scope of my invention will be more fully understood fromthe following description, taken in connection with the accompanyingdrawings, forming part hereof, and in which- Figure 1, is a view partlyin elevation and partly in vertical section on the liners-00, of Fig. 2;and Fig. 2, is a view partly in plan and partly in horizontal sectionthrough the locking device of the lamp, showing the magnet.

By reference to the drawings, the locking device of the lamp consists ofa catch 19, which is pivoted at h, to the top rim or flange of thecasing of the lamp and the hooked end of the catch is adapted to engagea notch or recess f, in the flange or rim of the said casing, asillustrated in Fig. 2, thus preventing access being had to the flame ofthe lamp. A movement of the catch I), normally engaged and and pressedby a spring m, is effected by means of a horse-shoe magnet A, as shownin broken section in Fig. 2, and whose poles are set onto the iron corepieces cand d, for magnetizing the same. The end i, of the catch 12, isattracted by an extension k, of the core piece (1. Such extension withits attracting face g, together with the attracting face e, of the corepiece c, causes the catch 1), to turn on the pivot 71., as clearlyillustrated in Fig. 2.

The projecting plate a, of tempered steelplate is bent on the upper andlower edges onto the rim or flange of the lamp and thus prevents accessbeing had to the catch by boring or otherwise; and this plate a, isprovided with an insulating plate Z, of unmagnetizable metal, forinstance, brass, German silver or other insulating material arranged onthe inner side of the plate opposite the end *5, of the catch b, toprevent said magnetizable plate a, acting on the catch and causing thelatter to turn on its pivot h.

It will be observed that by pulling on the magnet A, the insulatingplate Z, permits the end *5, of the catch 12, to be attracted by thecore piece it, and of the catch then turning on its pivot h, and whichcatch is by such action released from the notch f,- in order to permitof the lamp being opened.

Having thus described the nature and 0bj-ects of my invention, what Iclaim as new, and desire to secure by Letters Patent, is--- A minerssafety lamp provided with a notched flange or rim and havingcore-pieces, a magnet, a pivotal catch, a protecting plate arrangedaround said flange or rim and having insulating material interposedbetween the same and said plate opposite one end of said catch toprevent said plate from being magnetized, substantially as and for thepurposes set forth.

In witness whereof I have hereunto signed my name in the presence of twosubscribing witnesses.

CARL WOLF.

Witnesses:

FRIEDR. KGRNER, HERMANN MULLER.

